Alert archive / Louisiana / Areal Flood Warnings in 2021
Areal Flood Warning 22, NWS New Orleans, LA
NWS New Orleans, LA issued this areal flood warning at Sep 1, 2021, 9:50 PM CDT for Saint Tammany Parish, Tangipahoa Parish, Washington Parish, Louisiana; Hancock County, Pearl River County, Mississippi. It was in force for 11 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 1, 2021, 9:50 PM CDT (02:50 UTC)
- Expired
- Sep 2, 2021, 9:00 AM CDT
- In force
- 11 hr
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Hancock County, MS, Pearl River County, MS
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 00:00Z, 2.8 hours before the alert went out and 44 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1372 J/kg
- Mixed-layer CIN
- -90 J/kg
- Mixed-layer LCL
- 1055 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -22 m²/s²
- 0-3 km storm-relative helicity
- -1 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.6
What forecasters said that day
The local office's own words before this areal flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS New Orleans, LA wrote its last area forecast discussion before this areal flood warning went out at Sep 1, 8:54 PM CDT, 56 minutes earlier.
Area forecast discussion, Sep 1, 8:54 PM CDT, 56 minutes before
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</html>The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 9:45 PM CDT | Areal Flood Warning | LIX | Ascension, Livingston, Saint John the Baptist, Saint Tammany, Tangipahoa | 11 hr |
| Sep 1, 9:47 PM CDT | Areal Flood Warning | LIX | Jefferson, Lafourche, Livingston, Plaquemines, Saint Charles, Saint James and 1 more | 11 hr |
| Sep 2, 5:23 PM CDT | Special Weather Statement | LIX | Saint James | 22 min |
| Sep 2, 6:15 PM CDT | Special Weather Statement | LIX | Assumption | 45 min |
| Sep 1, 9:49 PM CDT | Areal Flood Warning | LIX | Harrison, Jackson | 11 hr |
Nearby
Areal Flood Warnings in Louisiana, 2021Areal Flood Warnings in Mississippi, 2021Every areal flood warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.